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diff --git a/utils/signals/programmer_test.cpp b/utils/signals/programmer_test.cpp
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+// Copyright 2010 The Kyua Authors.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+// notice, this list of conditions and the following disclaimer in the
+// documentation and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors
+// may be used to endorse or promote products derived from this software
+// without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "utils/signals/programmer.hpp"
+
+extern "C" {
+#include <signal.h>
+#include <unistd.h>
+}
+
+#include <atf-c++.hpp>
+
+#include "utils/sanity.hpp"
+
+namespace signals = utils::signals;
+
+
+namespace {
+
+
+namespace sigchld {
+
+
+static bool happened_1;
+static bool happened_2;
+
+
+void handler_1(const int signo) {
+ PRE(signo == SIGCHLD);
+ happened_1 = true;
+}
+
+
+void handler_2(const int signo) {
+ PRE(signo == SIGCHLD);
+ happened_2 = true;
+}
+
+
+} // namespace sigchld
+
+
+} // anonymous namespace
+
+
+ATF_TEST_CASE_WITHOUT_HEAD(program_unprogram);
+ATF_TEST_CASE_BODY(program_unprogram)
+{
+ signals::programmer programmer(SIGCHLD, sigchld::handler_1);
+ sigchld::happened_1 = false;
+ ::kill(::getpid(), SIGCHLD);
+ ATF_REQUIRE(sigchld::happened_1);
+
+ programmer.unprogram();
+ sigchld::happened_1 = false;
+ ::kill(::getpid(), SIGCHLD);
+ ATF_REQUIRE(!sigchld::happened_1);
+}
+
+
+ATF_TEST_CASE_WITHOUT_HEAD(scope);
+ATF_TEST_CASE_BODY(scope)
+{
+ {
+ signals::programmer programmer(SIGCHLD, sigchld::handler_1);
+ sigchld::happened_1 = false;
+ ::kill(::getpid(), SIGCHLD);
+ ATF_REQUIRE(sigchld::happened_1);
+ }
+
+ sigchld::happened_1 = false;
+ ::kill(::getpid(), SIGCHLD);
+ ATF_REQUIRE(!sigchld::happened_1);
+}
+
+
+ATF_TEST_CASE_WITHOUT_HEAD(nested);
+ATF_TEST_CASE_BODY(nested)
+{
+ signals::programmer programmer_1(SIGCHLD, sigchld::handler_1);
+ sigchld::happened_1 = false;
+ sigchld::happened_2 = false;
+ ::kill(::getpid(), SIGCHLD);
+ ATF_REQUIRE(sigchld::happened_1);
+ ATF_REQUIRE(!sigchld::happened_2);
+
+ signals::programmer programmer_2(SIGCHLD, sigchld::handler_2);
+ sigchld::happened_1 = false;
+ sigchld::happened_2 = false;
+ ::kill(::getpid(), SIGCHLD);
+ ATF_REQUIRE(!sigchld::happened_1);
+ ATF_REQUIRE(sigchld::happened_2);
+
+ programmer_2.unprogram();
+ sigchld::happened_1 = false;
+ sigchld::happened_2 = false;
+ ::kill(::getpid(), SIGCHLD);
+ ATF_REQUIRE(sigchld::happened_1);
+ ATF_REQUIRE(!sigchld::happened_2);
+
+ programmer_1.unprogram();
+ sigchld::happened_1 = false;
+ sigchld::happened_2 = false;
+ ::kill(::getpid(), SIGCHLD);
+ ATF_REQUIRE(!sigchld::happened_1);
+ ATF_REQUIRE(!sigchld::happened_2);
+}
+
+
+ATF_INIT_TEST_CASES(tcs)
+{
+ ATF_ADD_TEST_CASE(tcs, program_unprogram);
+ ATF_ADD_TEST_CASE(tcs, scope);
+ ATF_ADD_TEST_CASE(tcs, nested);
+}